diff --git a/SAS/TMSS/client/lib/tmss_http_rest_client.py b/SAS/TMSS/client/lib/tmss_http_rest_client.py
index f7d3fee1f76251001eb29337d4952f7ad8517511..e533b72380b62110293611f3eb360638b4d45ea8 100644
--- a/SAS/TMSS/client/lib/tmss_http_rest_client.py
+++ b/SAS/TMSS/client/lib/tmss_http_rest_client.py
@@ -106,7 +106,8 @@ class TMSSsession(object):
 
     def get_subtask_parset(self, subtask_id) -> str:
         '''get the lofar parameterset (as text) for the given subtask'''
-        result = self.session.get(url='%s/subtask/%s/parset' % (self.base_url, subtask_id))
+        result = self.session.get(url=self.get_full_url_for_path('/subtask/%s/parset' % (subtask_id,)),
+                                  headers={'Accept': 'text/plain'})
         if result.status_code >= 200 and result.status_code < 300:
             return result.content.decode('utf-8')
         raise Exception("Could not get parameterset for subtask %s.\nResponse: %s" % (subtask_id, result))
@@ -241,7 +242,7 @@ class TMSSsession(object):
 
     def specify_observation_task(self, task_id: int) -> requests.Response:
         """specify observation for the given draft task by just doing a REST API call """
-        result = self.session.get(url='%s/api/task/%s/specify_observation' % (self.base_url, task_id))
+        result = self.session.get(url=self.get_full_url_for_path('/task/%s/specify_observation' % (task_id,)))
         if result.status_code >= 200 and result.status_code < 300:
             return result.content.decode('utf-8')
         raise Exception("Could not specify observation for task %s.\nResponse: %s" % (task_id, result))
@@ -259,7 +260,7 @@ class TMSSsession(object):
     def get_setting(self, setting_name: str) -> {}:
         """get the value of a TMSS setting.
         returns the setting value upon success, or raises."""
-        response = self.session.get(url='%s/setting/%s/' % (self.base_url, setting_name),
+        response = self.session.get(url=self.get_full_url_for_path('/setting/%s/' % (setting_name,)),
                                     params={'format': 'json'})
 
         if response.status_code >= 200 and response.status_code < 300:
@@ -271,7 +272,7 @@ class TMSSsession(object):
     def set_setting(self, setting_name: str, setting_value: bool) -> {}:
         """set a value for a TMSS setting.
         returns the setting value upon success, or raises."""
-        response = self.session.patch(url='%s/setting/%s/' % (self.base_url, setting_name),
+        response = self.session.patch(url=self.get_full_url_for_path('/setting/%s/' % (setting_name,)),
                                       json={'value': setting_value})
 
         if response.status_code >= 200 and response.status_code < 300:
@@ -291,7 +292,7 @@ class TMSSsession(object):
             json_data['template'] = json.loads(template) if isinstance(template, str) else template
         json_data.update(**kwargs)
 
-        response = self.session.post(url='%s/%s/' % (self.base_url, template_path), json=json_data)
+        response = self.session.post(url=self.get_full_url_for_path(template_path), json=json_data)
         if response.status_code == 201:
             logger.info("created new template: %s", json.loads(response.text)['url'])
         else:
@@ -304,7 +305,7 @@ class TMSSsession(object):
             new_feedback = feedback
         else:
             new_feedback = "%s\n%s" % (existing_feedback, feedback)
-        response = self.session.patch(url='%s/subtask/%s/' % (self.base_url, subtask_id),
+        response = self.session.patch(url=self.get_full_url_for_path('/subtask/%s/' % (subtask_id,)),
                                       json={'raw_feedback': new_feedback},
                                       params={'format': 'json'})
 
@@ -318,7 +319,7 @@ class TMSSsession(object):
     def process_subtask_feedback_and_set_finished(self, subtask_id: int) -> {}:
         '''process the raw_feedback of a given subtask and set the subtask to finished on succes. Return the subtask
         with its new state, or raise an error'''
-        response = self.session.post(url='%s/subtask/%s/process_feedback_and_set_finished' % (self.base_url, subtask_id),
+        response = self.session.post(url=self.get_full_url_for_path('/subtask/%s/process_feedback_and_set_finished' % (subtask_id,)),
                                      params={'format': 'json'})
 
         if response.status_code >= 200 and response.status_code < 300: